General Strategy for Direct Synthesis of L1₀ Nanoparticle Alloys from Layered Precursor: The Case of FePt

Abstract

A general strategy for the synthesis of high chemically ordered L10 alloy nanoparticles is presented. L10 FePt nanoparticles are obtained directly from the atomically layered precursor FePtCl6·6H2O. The method is easy and low cost, and the FePt nanoparticles, obtained at 400 °C, present a very high magnetic anisotropy.

A Polyferroplatinyne Precursor for the Rapid Fabrication of L10‐FePt‐type Bit Patterned Media by Nanoimprint Lithography

“…Hence, the observed peak broadening in the PXRD spectrum can be attributed to the small size of NPs instead of structural disorder. [8] Figure 2 depicts the procedure of nanoimprint molding the bimetallic polymer P. Firstly, a silicon substrate was rinsed in acetone followed by deionized water coupled with sonication. Then, a saturated solution of P in chloroform was drop-cast onto the substrate.…”

“…Hence, some organometallic complexes containing both Fe and Pt atoms for use as a single source precursor were synthesized and applied to generate the L1 0 phase FePt NPs by the one-step decomposition. [8,9] However, direct and rapid patterning of the target FePt NPs is also a substantial challenge for many practical applications, which demand precise reading out and direct-writing onto the NPs. In particular, bit patterned media (BPM) made with FePt NPs are promising candidates for the next generation of magnetic recording systems.…”

Self-assembled inorganic nanopatterns (INPs) made by sol-gel dip-coating: Applications in nanotechnology and nanofabrication

“…In this context, magnetic nanocomposite surfaces composed of hard magnetic FePt nanoparticles into TiO 2 INPs, were prepared by controlled chemical solution deposition of hexaaquairon(II) hexachloroplatinate, ([Fe(H 2 O) 6 ][PtCl 6 ]) salt into the INP perforations, followed by its direct transformation into the FePt (fct) phase by thermal annealing at 400 C in a reductive atmosphere (see Fig. 16b) [43]. This strategy exploits the dip-coating process that is highly suitable to homogeneously impregnate porosity as a result of the progressive evaporation that tends to drag solutes within the porous network upon solvent departure [44].…”

Patterning of L10FePt nanoparticles with ultra-high coercivity for bit-patterned media

“…Besides, although this method demonstrates the feasibility to produce nanocrystals with smooth morphologies, the dual-source precursors involved such as Fe(CO)5 or Fe(acac)2 and Pt(acac)2, also bring about the difficulty for stoichiometric control. [30][31][32] Recently, single-source organometallic precursors such as (CO)3Fe(μ-dppm)(μ-CO)PtCl2 and FePt(CO)4dppmBr2 were reported, [33][34][35][36][37] in which the atomic ratio of Fe and Pt could be easily controlled. In such case, the precursors would decompose at the same decomposition temperature and the two types of metal atoms are homogeneously distributed in the organic framework at the molecular scale, which would be beneficial to prevent the agglomeration of FePt NPs.…”